<?xml version="1.0" encoding="ISO-8859-1"?><article xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<front>
<journal-meta>
<journal-id>0026-1742</journal-id>
<journal-title><![CDATA[Revista de la Facultad de Medicina (México)]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. Fac. Med. (Méx.)]]></abbrev-journal-title>
<issn>0026-1742</issn>
<publisher>
<publisher-name><![CDATA[Universidad Nacional Autónoma de México, Facultad de Medicina]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0026-17422024000200007</article-id>
<article-id pub-id-type="doi">10.22201/fm.24484865e.2024.67.2.02</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Trastornos de la coagulación: factor V Leiden, panorama biológico, clínico y epidemiológico]]></article-title>
<article-title xml:lang="en"><![CDATA[Coagulation Disorders: Factor V Leiden, Biological, Clinical, and Epidemiological Overview]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Hernández-Girón]]></surname>
<given-names><![CDATA[Carlos]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Cabrales-Arreola]]></surname>
<given-names><![CDATA[Jorge Luis]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Instituto Nacional de Salud Pública Centro de Investigaciones en Salud Poblacional ]]></institution>
<addr-line><![CDATA[Cuernavaca Mor]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>04</month>
<year>2024</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>04</month>
<year>2024</year>
</pub-date>
<volume>67</volume>
<numero>2</numero>
<fpage>7</fpage>
<lpage>18</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0026-17422024000200007&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0026-17422024000200007&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0026-17422024000200007&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen El sistema de coagulación mantiene la sangre en estado fluido en todo momento y, por tanto, está incesantemente activa durante toda la vida. Sin embargo, en el momento en que ocurre una lesión del sistema vascular, el sistema de coagulación inmediatamente gira 180° y transforma la sangre en un cuerpo sólido perfectamente localizado, al que llamamos coágulo. Este proceso, mediante el cual se forma un coágulo, se conoce como hemostasia, que es uno de los componentes del sistema de coagulación. La importancia de la mutación Leiden del factor V se basa en lo siguiente: el factor V de la coagulación es una proteína que se sintetiza en el hígado y el gen que lo codifica está situado en la región 23 del brazo largo del cromosoma 1, este factor circula en sangre periférica de manera inactiva hasta que interactúa con el factor X activado, formando un complejo que convierte al factor II (protrombina) en trombina, que va a tener su acción sobre el fibrinógeno convirtiéndolo en fibrina. La regulación del factor V activado se da por la actividad de la proteína C activada, cuando el factor V tiene una mutación (nombrada Leiden) que es ocasionada por el cambio de una adenina por una guanina en el nucleótido 1691 del factor V (G1691A), que causa que se sustituya una arginina por una glutamina en el residuo 506 de la proteína factor V; la proteína resultante es un factor V anómalo, mismo que no puede inactivarse por la proteína C activada, por lo que el factor V continúa activado y no puede impedir que el proceso de coagulación se detenga. En nuestro país (considerando varias afecciones) se ha descrito en diversas publicaciones de investigadores mexicanos que las mutaciones Leiden del factor V y la G20210A de la protrombina no son frecuentes, como lo son en los países europeos.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract The coagulation system always keeps the blood in a fluid state and is therefore incessantly active throughout life. However, the moment an injury to the vascular system occurs, the coagulation system immediately rotates 180° and transforms the blood into a perfectly localized solid body, which we call a clot. This process, by which a clot forms, is known as hemostasis, which is one of the components of the coagulation system. The importance of the Leiden mutation of factor V is based on the following: coagulation factor V is a protein that is synthesized in the liver and the gene that encodes it is located in region 23 of the long arm of chromosome 1, this factor circulates in peripheral blood inactively until it interacts with activated factor X forming a complex that converts factor II (prothrombin) into thrombin, which will have its action on fibrinogen turning it into fibrin. The regulation of activated factor V is given by the activity of activated protein C, when factor V has a mutation (named Leiden) that is caused by the exchange of an adenine for a guanine in the nucleotide 1691 of factor V (G1691A), which causes arginine to be replaced by a glutamine in the 506 residue of the factor V protein, the resulting protein is an abnormal factor V, which cannot be inactivated by activated protein C, so factor V remains activated and cannot prevent the clotting process from stopping. In our country (considering several conditions) it has been described in various publications of Mexican researchers that Leiden mutations of factor V and G20210A of prothrombin are not frequent, as they are in European countries.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Trombofilia]]></kwd>
<kwd lng="es"><![CDATA[factor V Leiden]]></kwd>
<kwd lng="es"><![CDATA[trastornos de la coagulación]]></kwd>
<kwd lng="es"><![CDATA[México]]></kwd>
<kwd lng="en"><![CDATA[Thrombophilia]]></kwd>
<kwd lng="en"><![CDATA[factor V Leiden]]></kwd>
<kwd lng="en"><![CDATA[coagulation disorders]]></kwd>
<kwd lng="en"><![CDATA[Mexico]]></kwd>
</kwd-group>
</article-meta>
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